Grate bar



(No Model.)

A. 0. MANN.

GRATE BAIL N0. 275,679. Patented Apr. 10,1883.

@ Mamas amamn Bylaw/845 2 any. n, c

UNITED STATES PATENT .OFFICE.

AMOS G. MANN, OF ST. LOUIS, MISSOURI.

GRATE-BAR.

SPECIFICATION forming part of Letters Patent No. 275,679, dated April10, 1883.

- Application filed November 9, 1882. (No model.)

To all whom it may concern:

Be it known that I, AMOS G. MANN, of the city of St. Louis, in the Stateof Missouri, have invented a new and useful Improvement in Grate-Bars,of which the following is a specification.

This invention relates to all that class of grates used generally inconnection with steam boilers and furnaces; and its object is to producea grate-bar which shall be lighter, stronger, and more durable andcheaper than the ordinary grate bars, and which will secure a moreperfect combustion of the fuel.

To this end the invention consists of a hollow bar or casting having anaperture at each end and similar apertures along the lower face of thebar to allow the heated air in the interior of the bar to escape.

In order that my invention may be more fully understood, 1 will proceedto describe it with reference to the accompanying drawings, in which-Figure 1 is a perspective View ofmy improved grate-bar. Fig. 2 is alongitudinal vertical section, and Fig. 3 a vertical transverse section,thereof.

My improved grate-bar A is cast hollow, as shown, and provided with lugsa'to support it in the fire pot or chamber. The base of thewardly-projecting longitudinal flanges B to increase the strength of thebar. Situated at suitable distances along the base of the bar areapertures 0, opening into the hollow interior of the bar, and in theends of the bar are similar apertures, C, so as to admit of a constantcurrent of air passing upward through the apertures Q and out of theapertures O,

| grate bar is provided at its sides with down- 30 and thus serve tokeep the bar from being burned. To further this end, and to prevent theformation of clinkers setting and forming a close mass on the bars, Iform longitudinal ridges E on the upper side of the same, which aid inkeeping the fire open, and so facilitate the production of greater heatwith less fuel.

Having thus described my invention, the following iswhat I claim as newtherein and desire to secure by Letters Patent:

A hollow grate-bar provided with apertures G G O 0 upon the bottom and G0' upon the ends thereof, for thepurpose described, having ridges uponits upper surface, flanges upon its lower surface, and lugs at its sidesand ends, as and for the purposes set forth.

AMOS O. MANN. Witnesses:

GEO. H. KNIGHT, ALBERT G. FIsH.

